Draw circle perpendicular to a line...

Hi,

I want to programatically draw a circle, at a given point along a line (or spline), so that the circle is perpendicular to the line at that point.

 

So, almost like extruding a shape along a linear element, where the shape (a planar shape) has to be placed perpendicular to the linear element.

 

Been looking what methods are available, but cant find one that makes any sense.

BTW - doing this in C# .net, so been looking at the VBA help.

Thanks!

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